"This is an area at sale time that would be full of people, full of our staff," Wilson explained. "This happened about two hours after the facility closed, so there was nobody here, which is a good thing."

Investigators say Benson, 52, hopped into a D-6 bulldozer, smashed through a chain-link fence, then barreled the dozer into the empty office building causing $1.5 million worth of damage.

"You know, obviously he needs some help," Wilson said. "His family needs some help. Our staff and everybody is safe. So that was the biggest issue."

Benson has worked at Ritchie Brothers for 12 years. Wilson said he has had a few talks with the worker recently, but never imagined anything would trigger that kind of incident.

"At the end of a sale, everybody is pretty tired because of the long hours. Was he tired and a little beat up from the sale? Sure, but that's not abnormal," Wilson said.

Benson is facing charges of criminal mischief. Workers are waiting for insurance adjusters to come and assess the damage so they can rebuild.